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It's probably of the same family, so somewhere within the 197 plants of the willowherbs
https://en.m.wikipedia.org/wiki/Epilobium
Exactly which would probably need a botanist to look at it
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Not a website, but The Wild Flower Key by Francis Rose is still the gold standard for plant identification. Takes a bit of practice to use though.
https://wordery.com/the-wild-flower-key-francis-rose-9780723251750
https://www.rhs.org.uk/Advice/profile?PID=993
Rosebay willowherb
The tall, pretty pink flower spikes of rosebay willowherb